Since I was received into the Church four years ago, I can say just the same.
Of course it matters that we sin; but we are called to repentance and amendment of life. In this the Church and its sacraments are our great ally. If we trust in it and them and we pray, we can begin to amend our lives with God's help.
Of course it is a life long process - theosis as the Orthodox call it - but it begins with us and our willingness to help the Church help us.
Truly He says that all who are heavily laden should come to him and lay their burden upon Him. He died that we might have life in abundance through His glorious resurrection. Here, in the middle of Holy Week, it is good to remind ourselves of that - and your post does just that.
In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins. (1 John 4:10)